feat: publish FreeRTOS C FC10 card

README.md

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+# FC10 — direct-to-task notifications
+
+One receiver task exercises three notification contracts without a queue,
+semaphore or EventGroup object:
+
+- three `xTaskNotifyGive()` calls accumulate to
+  `ulTaskNotifyTake(pdTRUE)==3`;
+- two `eSetValueWithOverwrite` posts retain the latest value `0x22`;
+- two `eSetBits` posts combine to `0x24`.
+
+The high-priority sender waits for an explicit receiver phase and public
+`eBlocked` state before every batch. Therefore the receiver cannot run between
+posts and accidentally turn `3` into `1+1+1`. A zero-time probe proves that
+the slot value is cleared between protocols.
+
+```sh
+make task1 host-test check-abi sim check-determinism
+```
+
+The canonical Hazard3 run commits E01–E12 and prints digest `c60747cb`.
+Interactive views A2, A3, A5, A6, A7 and A8 connect the target handle, TCB
+slot, flow, state, runtime evidence and protocol choices.
+
+Source basis: FreeRTOS Kernel Book, Chapter 10.